new Set() 1
[javascript] ๋ฌธ์ž์—ด, ๋ฐฐ์—ด ์ค‘๋ณต ์ œ๊ฑฐ (Set, filter)

new Set([iterable]); ์‚ฝ์ž… ์ˆœ์„œ๋Œ€๋กœ ์š”์†Œ ์ˆœํšŒ, Set์—๋Š” ์ค‘๋ณต๋œ ๊ฐ’์ด ๋“ค์–ด์˜ฌ ์ˆ˜ ์—†๋‹ค. const setTest = new Set(); setTest.add(1);// {1} setTest.add(2);// {1, 2} // 1์„ addํ•ด๋„ set์— 1์ด ์žˆ์–ด์„œ ๋ฌด์‹œ๋จ setTest.add(1);// {1, 2} arr.filter(callback(element[, index[, array]])[, thisArg]) callback : ์š”์†Œ๋ฅผ ๊ฑธ๋Ÿฌ์ฃผ๋Š” ํ•จ์ˆ˜, ์กฐ๊ฑด์— ๋งž์ง€ ์•Š์œผ๋ฉด ์‚ญ์ œ element : ์ฒ˜๋ฆฌํ•  ํ˜„์žฌ ์š”์†Œ index(option) : ์ฒ˜๋ฆฌํ•  ํ˜„์žฌ ์š”์†Œ์˜ ์ธ๋ฑ์Šค const filterArr = [1, 2, 3, 4, 5]; filterArr.filter(function(v){..
Javascript 2021.08.28
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๋”๋ณด๊ธฐ

ํ‹ฐ์Šคํ† ๋ฆฌํˆด๋ฐ”